<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        input[type="text"] {
          width: 100px;
          height: 100px;
          background-color: pink;
        }
    </style>
</head>
<body>
用户名：<input type="text">
</body>
</html>